c++delete遇到异常

#include <iostream>
#include<vector>
using namespace std;

typedef struct{
    int x = 0;
    int y = 0;
}Point;

class A{
public:
    A(Point* s) {
        p = s;
    }
    ~A()
    {
        if (p) {
            delete p;
            p = NULL;
        }
    }
private:
    Point* p;
};
int main()
{
    Point* point = new Point();
    A* a = new A(point);
    if (point) {
        delete point;
        point = NULL;
    }
    if (a) {
        delete a;
        a = NULL;
    }
}

point已被化为零，却没把类A的实例化里同一地址的p清零，怎么办？？万分感谢！

你这里double deleting了。建议不要用裸指针，用智能指针，比如shared_ptr, weak_ptr, unique_ptr

因为A的构造函数是按值传递的，拷贝了一份指针，所以说A里面的p和main里面的point地址不同，当然不可以。你把30行到33行删去就行，多此一举。